Re: [R] Month end calculations
Hi Shubha, By using the tautology that the end of a month is immediately followed by the first of a month, the following returns a TRUE when the date is the last day of a month IsMonthEnd - format(MyDates + 1, %d) == 01 where MyDates is a vector, or column in a data frame, typed as Date (eg with as.Date) -- HTH, Jim Porzak Responsys, Inc. San Francisco, CA http://www.linkedin.com/in/jimporzak On 8/29/07, Shubha Vishwanath Karanth [EMAIL PROTECTED] wrote: Hi R users, Is there a function in R, which does some calculation only for the month end in a daily data?... In other words, is there a command in R, equivalent to last. function in SAS? BR, Shubha [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Text Mining
Also see Ingo Feinerer's tm package and his nice vignette. On 7/6/07, LE PAPE Gilles [EMAIL PROTECTED] wrote: Hi everybody, I am a new R user. Is there any package devoted to text mining analysis in R ? Thanks Gilles [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak Responsys, Inc. San Francisco, CA http://www.linkedin.com/in/jimporzak [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Random Forest
Rubin, I'm assuming you really do want to do a classification? check out ?factor I'm guessing you have coded MMS_ENABLED_HANDSET as 0, 1; or some such numeric coding. suggest you do: dat$MMS_ENABLED_HANDSET - factor(dat$MMS_ENABLED_HANDSET) to force your response variable to be a factor (AKA categorical) And, perhaps, label your levels with something like: levels(dat$MMS_ENABLED_HANDSET) - c(Not Enabled, MMS Enabled) On 4/23/07, Ruben Feldman [EMAIL PROTECTED] wrote: Hi R-wizards, I ran a random forest on a dataset where the response variable had two possible values. It returned a warning telling me that it did regression and if that was really what I wanted. Does anybody know what is being in terms of the algorithm when it does a regression? (the random forest is used as a regression, how does that work?) Thanks for your time! Ruben [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak San Francisco, CA http://www.linkedin.com/in/jimporzak __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Random Forest
Google random forests see Leo Brieman's site, Wikipedia, esp link at bottom of wikipedia page to Andy Matt's article in RNews I did a DMA/AC webinar in January. Slides are at: http://www.porzak.com/JimArchive/JimPorzak_RFwithR_DMAAC_Jan07_webinar.pdf On 4/23/07, Ron Michael [EMAIL PROTECTED] wrote: Dear all R gurus, I am really sorry if my query embraces anyone. Can anyone give me some introductory papers or suggestions about what Random Forest is? Thanks and regards, - Original Message From: Weiwei Shi [EMAIL PROTECTED] To: Ruben Feldman [EMAIL PROTECTED] Cc: r-help@stat.math.ethz.ch Sent: Monday, April 23, 2007 8:56:29 PM Subject: Re: [R] Random Forest Hi, Ruben: fit$confusion if you provide your test data, then you can also access the confusion matrix of test data by fit$test$confusion there are details of how to use randomForest by reading: ?randomForest HTH, Weiwei On 4/22/07, Ruben Feldman [EMAIL PROTECTED] wrote: Hi, I am trying to print out my confusion matrix after having created my random forest. I have put in this command: fit-randomForest(MMS_ENABLED_HANDSET~.,data=dat,ntree=500,mtry=14, na.action=na.omit,confusion=TRUE) but I can't get it to give me the confusion matrix, anyone know how this works? Thansk! Ruben [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Weiwei Shi, Ph.D Research Scientist GeneGO, Inc. Did you always know? No, I did not. But I believed... ---Matrix III __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak San Francisco, CA http://www.linkedin.com/in/jimporzak __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Random Forest
Rubin, just type fit or print(fit). confusion = TRUE will not be recognized by randomForest. If you are not seeing the confusion matrix, MMS_ENABLED_HANDSET is not a factor and, thus, a regression fit is being done, not classification as you apparently desire. On 4/22/07, Ruben Feldman [EMAIL PROTECTED] wrote: Hi, I am trying to print out my confusion matrix after having created my random forest. I have put in this command: fit-randomForest(MMS_ENABLED_HANDSET~.,data=dat,ntree=500,mtry=14, na.action=na.omit,confusion=TRUE) but I can't get it to give me the confusion matrix, anyone know how this works? Thansk! Ruben [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak San Francisco, CA http://www.linkedin.com/in/jimporzak [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] any way to append a table in SQL server
see... library(RODBC) ?sqlSave and rest of RODBC docs. You could also pass a SQL INSERT statement through sqlQuery() On 3/20/07, Wensui Liu [EMAIL PROTECTED] wrote: Dear Lister, Is there an interface in R with SQL server that allows me to append records to table in the DB? Might I do that using RODBC? Thanks a lot. -- WenSui Liu A lousy statistician who happens to know a little programming (http://spaces.msn.com/statcompute/blog) __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH/Best, Jim Porzak Loyalty Matrix Inc. San Francisco, CA http://www.linkedin.com/in/jimporzak __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] plot.randomForest default mtry values
Joe, I'm guessing you are doing a 2-category problem. The three lines are OOB errors for overall error and each of the two categories. There is only one default value of mtry. You can specify a different mtry when the forest is built (in your call to randomForest()), but it applies to the entire forest. On 3/15/07, Joseph Retzer [EMAIL PROTECTED] wrote: When using the plot.randomForest method, 3 error series (by number of trees) are plotted. I suspect they are associated with the 3 default values of mtry that are used, for example, in the tuneRF method but I'm not sure. Could someone confirm? Also, is it possible to force different values of mtry to be used when creating the plots? I specified them explicitly in the randomForest statement but it did not seem to have an effect. Many thanks, Joe Retzer [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA http://www.linkedin.com/in/jimporzak __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R book advice
Hi Paul, All three are excellent choices, so you won't go wrong with random choice. Here is your first R lesson: RBooks - c(Verzani, Crawley, Dalgaard) sample(RBooks, 1) Seriously, I expect you will end up with all three. Here are my mini-reviews (in order of publication) Peter Dalgaard's book came out just before I first discovered R in the winter of 2002. It was my intro to R and a good stats refresher. Charles' assessment correct. At only ~250 pages, it is not at all intimidating, however Peter does build up to some intermediate topics like logistic regression and survival analysis. My copy is now somewhat tattered I should get a replacement! John Verzani had, and still has, a preliminary version of his book on CRAN: http://cran.cnr.berkeley.edu/doc/contrib/Verzani-SimpleR.pdf so I was very excited when it come out in hard copy - much expanded - as Using R. He has more visualization examples - which I like. I do wish John would have used - instead of = for assignment. It's important to start thinking in R - = drags me back to my FORTRAN days. Being a mid-western American, I love Michael Crawley's British view of the world! He really forces you to get an intuitive feel for what is going on. Also good visualization emphasis. My only criticism is he suggests using Word to save your work. You should really use a more serious text editor/environment. I generally use JGR today, having moved from RWinEdt and TextPad. The Linux folks love ESS, but that is how they were brought up. On 2/15/07, Paul Lynch [EMAIL PROTECTED] wrote: I'm looking for a book for someone completely ignorant of statistics who wishes to learn both statistics and R. I've found three possibilities, one by Verzani (Using R for Introductory Statistics), one by Crawley (Statistics: An Introduction using R), and one by Dalgaard (Introductory Statistics with R). Do these books have different emphases, perspectives, or strengths? Should I just pick one at random and buy it? Thanks, --Paul __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA http://www.linkedin.com/in/jimporzak __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] JGR data editor question
Hi Bob, I can not reproduce your problem, with possible exception in your step 2: In data editor, you need to click off of the last cell you edited for the changes to take On 2/10/07, Muenchen, Robert A (Bob) [EMAIL PROTECTED] wrote: Hi All, I'm learning JGR 1.4-15 with R 2.4.1 in Windows XP (all patches applied). JGR looks great but I'm having trouble getting the data editor to save my results. I don't see anything in R-help about it. Here are the steps I followed: 1. I chose ToolsObject Browser double-clicked on a data frame, mydata. 2. A spreadsheet editor popped up and allowed me to make changes. 3. I clicked Update at the bottom right of the data editor screen. 4. It asked, Export to R? and has Export as: mydata filled in. 5. I clicked Yes and then closed the window by clicking the usual [X] in the top right corner. 6. Double-clicking the data file again opened it back up but the changes were gone. Am I missing a step? Thanks, Bob = Bob Muenchen (pronounced Min'-chen), Manager Statistical Consulting Center U of TN Office of Information Technology 200 Stokely Management Center, Knoxville, TN 37996-0520 Voice: (865) 974-5230 FAX: (865) 974-4810 Email: [EMAIL PROTECTED] Web: http://oit.utk.edu/scc, News: http://listserv.utk.edu/archives/statnews.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA http://www.linkedin.com/in/jimporzak __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] R in Industry - new SIG
Thanks Max ( Martin)!
I was about to encourage this. Once the head hunters get wind of this,
I expect a lot of activity - hopefully most will be relevant.
Max, I'd be willing to chip in if you need admin help.
--
Best,
Jim Porzak
Loyalty Matrix Inc.
San Francisco, CA
http://www.linkedin.com/in/jimporzak
On 2/8/07, Kuhn, Max [EMAIL PROTECTED] wrote:
Martin Maechler called my bluff on this suggestion. I'm now the admin
for the new special interest group for R related job postings:
https://stat.ethz.ch/mailman/listinfo/r-sig-jobs
Please send appropriate emails to this list. There are some simple rules
for postings (e.g. no attachments etc).
Max
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kuhn, Max
Sent: Tuesday, February 06, 2007 5:10 PM
To: Doran, Harold; R-help@stat.math.ethz.ch
Subject: Re: [R] R in Industry
As someone who has (reluctantly) sent job postings to R Help, I think
that a SIG would be a good idea.
Max
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Doran, Harold
Sent: Tuesday, February 06, 2007 2:08 PM
To: R-help@stat.math.ethz.ch
Subject: [R] R in Industry
The other day, CNN had a story on working at Google. Out of curiosity, I
went to the Google employment web site (I'm not looking, but just
curious). In perusing their job posts for statisticians, preference is
given to those who use R and python. Other languages, S-Plus and
something called SAS were listed as lower priorities.
When I started using Python, I noted they have a portion of the web site
with job postings. CRAN does not have something similar, but think it
might be useful. I think R is becoming more widely used in industry and
I wonder if helping it move along a bit, the maintainer of CRAN could
create a section of the web site devoted to jobs where R is a
requirement.
Hence, we could have our own little monster.com kind of thing going
on. Of the multitude of ways the gospel can be spread, this is small.
But, I think every small step forward is good.
Anyone think this is useful?
Harold
--
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Re: [R] comparing random forests and classification trees
Amy, et al, I agree with you and the group that comparing test set classification errors between the two methods is the way to go. On interpretation, I find the partial dependence plots from randomForest are useful - especially when talking to clients about what the forest means. See slides 32 to 38 in my recent DMA presentation below for some examples. (When looking at the plots for continuous variables, it's really important to pay attention to the decile rug plot on the x-axis so as to not get distracted by the edges which apply to a small part of the population) I would argue that, except for simple text book examples, a full classification tree is not all that easy to interpret. Sure, anyone can walk through each branch, the over all meaning gets lost in the trees. http://loyaltymatrix.com/JimPorzak_RFwithR_DMAAC_Jan07_webinar.pdf On 1/30/07, Darin A. England [EMAIL PROTECTED] wrote: Amy, I have also had this issue with randomForest, that is, you lose the ability to explain the classifier in a simple way to non-specialists (everyone can understand the single decision tree.) As far as comparing the accuracy of the two, I think that you are correct in comparing them by the actual vs predicted tables. randomForest reports this as the confusion matrix, and it also reports the out-of-bag error, which I think you are referring to. I would not compare the rf out-of-bag error with the rpart relative error (or cross-validated error if you are doing cross validation.) So, for what it's worth I think you are correct. Also, do you know about ctree in the party package? If you want to retain the explanatory power of a single tree and have a nice accurate classifier, I have found ctree to work quite well. HTH, Darin On Mon, Jan 29, 2007 at 11:34:51AM +1100, Amy Koch wrote: Hi, I have done an analysis using 'rpart' to construct a Classification Tree. I am wanting to retain the output in tree form so that it is easily interpretable. However, I am wanting to compare the 'accuracy' of the tree to a Random Forest to estimate how much predictive ability is lost by using one simple tree. My understanding is that the error automatically displayed by the two functions is calculated differently so it is therefore incorrect to use this as a comparison. Instead I have produced a table for both analyses comparing the observed and predicted response. E.g. table(data$dependent,predict(model,type=class)) I am looking for confirmation that (a) it is incorrect to compare the error estimates for the two techniques and (b) that comparing the misclassification rates is an appropriate method for comparing the two techniques. Thanks Amy Amelia Koch University of Tasmania School of Geography and Environmental Studies Private Bag 78 Hobart Tasmania, Australia 7001 Ph: +61 3 6226 7454 [EMAIL PROTECTED] [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] help with RandomForest classwt option
See Andy's previous post on this. -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA === Liaw, Andy [EMAIL PROTECTED] Thu, Oct 27, 2005 at 8:37 AM To: David L. Van Brunt, Ph.D. [EMAIL PROTECTED], Gabor Grothendieck [EMAIL PROTECTED] Cc: r-help@stat.math.ethz.ch classwt in the current version of the randomForest package doesn't work too well. (It's what was in version 3.x of the original Fortran code by Breiman and Cutler, not the one in the new Fortran code.) I'd advise against using it. sampsize and strata can be use in conjunction. If strata is not specified, the class labels will be used. Take the iris data as an example: randomForest(Species ~ ., iris, sampsize=c(10, 30, 10)) says to randomly draw 10, 30 and 10 from the three species (with replacement) to grow each tree. If you are unsure of the labels, use named vector, e.g., randomForest(Species ~ ., iris, sampsize=c(setosa=10, versicolor=30, virginica=10)) Now, if you want the stratified sampling to be done using a different variable than the class labels; e.g., for multi-centered clinical trial data, you want to draw the same number of patients per center to grow each tree (I'm just making things up, not that that necessarily makes any sense), you can do something like: randomForest(..., strata=center, sampsize=rep(min(table(center))), nlevels(center))) which draws the same number of patients (minimum at any center) from each center to grow each tree. Hope that's clear. Eventually all such things will be in the yet to be written package vignette... Andy On 1/28/07, Betty Health [EMAIL PROTECTED] wrote: Hello there, I am working on an extremely unbalanced two class classification problems. I wanna use classwt with down sampling together. By checking the rfNews() in R, it looks that classwt is not working yet. Then I looked at the software from Salford. I did not find the down sampling option. I am wondering if you have any experience to deal with this problem. Do you know any method or softwares can handle this problem? Thank you very much!! Betty [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] xlab, ylab in balloonplot(tab)?
I'm not understanding something. I'm trying to add xlab ylab to a balloon plot of a table object. From docs I thought following should work: require(gplots) # From balloonplot example: # Create an example using table xnames - sample( letters[1:3], 50, replace=2) ynames - sample( 1:5, 50, replace=2) tab - table(xnames, ynames) balloonplot(tab) # Try xlab, ylab: balloonplot(tab, xlab = MyX, ylab = MyY) But second plot is no different from first. R.version.string: Version 2.3.1 (2006-06-01) gplots version: 2.3.0 on WinXP SP1 -- TIA, Jim Porzak Loyalty Matrix Inc. San Francisco, CA [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] xlab, ylab in balloonplot(tab)?
Dear ListRs, I'm not understanding something. I'm trying to add xlab ylab to a balloon plot of a table object. From gplots docs I thought following should work: require(gplots) # From balloonplot example: # Create an example using table xnames - sample( letters[1:3], 50, replace=2) ynames - sample( 1:5, 50, replace=2) tab - table(xnames, ynames) balloonplot(tab) # Try xlab, ylab: balloonplot(tab, xlab = MyX, ylab = MyY) But second plot is no different from first. R.version.string: Version 2.3.1 (2006-06-01) gplots version: 2.3.0 on WinXP SP1 -- TIA, Jim Porzak Loyalty Matrix Inc. San Francisco, CA [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] distribution of daily rainfall values in binned categories
?hist read about breaks On 6/27/06, etienne [EMAIL PROTECTED] wrote: Hi, I'm a newbie in using R and I would like to have a few clues as to how I could compute and plot a distribution of daily rainfall intensity in different categories. I have daily values (mm/day) for several years and I need to show the frequency of 0-1, 1-2.5, 2.5-5, 5-10, 10-20, 20+ mm/day. Can this be done easily? Thanks, Etienne __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Get list of ODBC data sources?
Hello R Helpers, Before setting up a connection with RODBC, I would like to present my users with a pick list of ODBC data sources available in their environment. I may be missing something, but don't see anything in RODBC itself to return list of sources for use in select.list(). Any hints? I'm running 2.3.0 on Win XP SP2. -- TIA, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] data management on R
C - cbind(A[, 1], B[, 2]) On 3/23/06, zhijie zhang [EMAIL PROTECTED] wrote: Dear friends, i have two dataset: A and B A: x y 1 2 3 4 B: m n 1 2 7 8 How to generate datasetC: C: x n 1 2 3 8 i know sas can do it easily, what about R? -- Kind Regards, __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Plotting FAQ?
Then there is the Graphing section of Paul Johnson's Rtips ... http://pj.freefaculty.org/R/Rtips.html#5 On 3/3/06, Dan Bolser [EMAIL PROTECTED] wrote: Hi, Since I started to make some 'final' plots of my data I found that I have tons of questions related to 'the little things'. Rather than bother the list with all the questions (ahem), or search the archives for similar questions and translate the context, I would like to find a FAQ for plotting in particular (and R programming in general). I know for sure (searching the list) that my questions have been answered many times and in many different contexts, however, I can't find any list of generic (best) solutions to common problems. For example, (a bit on the 'details' side, but...) How do I make my y axis labels / names appear horizontally? How do I put a plot within a plot? How do I scale the legend text in barplot(...,legend=T)? How do I generate a legend just like barplot(...,legend=T) using legend()? How do I give my axis labels a bit more space? (Shift the left/bottom of the plotting area right/up from the left/bottom of the device area)? These questions spring to mind because they are problems I am trying to deal with, I am sure you could imagine loads of more basic plotting questions. An FAQ is a great place to archive all the best community knowledge about what library is good for what functionality and what 'tips tricks' have the coolest code. Where should I look? Thanks for any help, Dan. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] fft
Bill, ?fft Do you have a specific question? On 2/9/06, Bill Hunsicker [EMAIL PROTECTED] wrote: R-help: I need to do a fft on a data set. I was wondering if any guidance may be available. Regards, Bill Bill Hunsicker RF Micro Devices 7625 Thorndike Road Greensboro, NC 27409 336-678-5260 610-597-9985(m) __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Glossay of available R functions
Alexandre Patricia, As Bert Gunter periodically points out: Newbies (and others!) may find useful the R Reference Card made available by Tom Short and Rpad at http://www.rpad.org/Rpad/Rpad-refcard.pdf or through the Contributed link on CRAN (where some other reference cards are also linked). It categorizes and organizes a bunch of R's basic, most used functions so that they can be easily found. For example, paste() is under the Strings heading and expand.grid() is under Data Creation. For newbies struggling to find the right R function as well as veterans who can't quite remember the function name, it's very handy. I still keep a hard copy of Tom Short's referncece card handy, as do most of my colleagues at Loyalty Matrix. -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA On 1/30/06, Patricia J. Hawkins [EMAIL PROTECTED] wrote: ASA == Alexandre Santos Aguiar [EMAIL PROTECTED] writes: ASA I am new to R and read this list to learn. It is amazing how ASA frequently new functions pop in messages. Useful and timesaving ASA functions like subset (above) must be documented somewhere. ASA Is there a glossary of functions? I'm also new to R, and was wondering the same thing. Took a bunch of tries, but if you run start.help() and then choose Packages, then Base, you will get the list of functions. As a newcomer, I hesitate to suggest this, but maybe there should be a comment on the index page to that effect? -- Patricia J. Hawkins Hawkins Internet Applications www.hawkinsia.com __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] R training courses
Internally, we did an R Programming Study Group using Thomas Lumley's
excellent slides
http://faculty.washington.edu/tlumley/Rcourse/
over 2 1/2 weeks. Individual success depended on individual motivation. The
couple of folks that needed to come up to speed quickly did so.
I broke Thomas's course into 7 sections. Assigned sections every other day
(Mon, Wed, Fri, ...). We used our internal wiki to exchange questions,
commnts, hints, etc.
Our need was really R programming. If your needs are more statistical
focused, you could use one of introductory texts.
--
HTH,
Jim Porzak
Loyalty Matrix Inc.
San Francisco, CA
On 2/2/06, Wei Qiu [EMAIL PROTECTED] wrote:
I am also looking for this kind of courses. Any suggestion will be greatly
appreciated. Lucy
On Thu, 2 Feb 2006, Walker, Russell wrote:
Hi All,
I am interested in learning about people's experience with R training or
courses. What worked, what didn't? What do you recommend?
Also, if there any groups or individuals that have and can offer R
training courses, please contact me directly. I would like to learn
about your services.
Thanks for your input and help. Please feel free to contact me directly.
Russ
Russell Walker, Ph.D.
Senior Strategist
CapitalOne Financial, Inc.
1500 Capital One Drive
Richmond, VA 23238 USA
Internal Zip 12074-0340
External +1 804 855-3512
[EMAIL PROTECTED]
The information contained in this e-mail is confidential
and...{{dropped}}
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Re: [R] In which application areas is R used?
my favorites: customer/marketing analytics -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] reg peak detection
Ram, See excelent thread here last month. Search for finding peaks On 12/8/05, SHRIRAM R SAMPAT [EMAIL PROTECTED] wrote: Hallo everybody, I am doing a thesis in video extensometry and one my approaches requires peak detection in a two dimensional data. If would be grateful if anyone can throw some light on this for me by giving me some hints on how to do it or give me some links for it. thank very much in advance. Ram __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] getting started, reading listing and saving data
Ronnie, try head? tail? and, I also fine useful after loading str? On 11/22/05, Ronnie Babigumira [EMAIL PROTECTED] wrote: Dear List I am new to R and to the list and will try best as I can be clear and concise. My apologies if anything I write contravenes the posting code on this list. I would also like to say I have run through most of the material on the R website before writing this email however, I am stuck. Here is what I want to do and what I have done 1. Read a comma seperated text file into R I have used read.csv and it seems to have worked 2. List the a few observations to make sure the right stuff came in I have failed to find a command that allows me to list a few observations and would appreciate some help on this (I have used edit which pops up an spreadsheet however, I would prefer a command that allows me to list a few observations for inspection) 3. Save this data as an r dataset I cant seem to figure this out (I tried save(mytextfile, file = myrdata) but when I try to load what I saved, I get an error message Error: bad restore file magic number (file may be corrupted) -- no data loaded 4. Load this r dataset and proceed to work on it I would appreciate some help. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] sorting of data
One of the most useful functions: ?subset as in nsmSubData - subset(nsmalldata, SESSIONID==7757513) On 10/26/05, Bill Hunsicker [EMAIL PROTECTED] wrote: R-Help, I am trying to reduce at data set to rows where a specified value occurs in a specified value. Below is a screen capture of Rgui: nsmalldata -read.csv(c:\\DATA\\UNITY\\\PASS0_DOWNFADE\\nsmall.csv) nsmalldata BOARDNUMBER SESSIONID MATRIXID ARRAYPOINT Temperature PS1 PS2 PS13 PS14 PS15 1LB0DC 3043 7757513 1 - - - 3.65 -5 2LB0DC 3043 7757515 1 - - - 3.65 -5 3LB0DC 3043 7757517 1 - - - 3.65 -5 4LB0DC 3043 7757520 1 - - - 3.65 -5 5LB0DC 3043 7757522 1 - - - 3.65 -5 6LB0DC 3043 7757524 1 - - - 3.65 -5 7LB0DC 3043 7757526 1 - - - 3.65 -5 8LB0DC 3043 7757528 1 - - - 3.65 -5 9LB0DC 3043 7757531 1 - - - 3.65 -5 10 LB0DC 3043 7757533 1 - - - 3.65 -5 11 LB0DC 3043 7757535 1 - - - 3.65 -5 12 LB0DC 3043 7757537 1 - - - 3.65 -5 13 LB0DC 3043 7757540 1 - - - 3.65 -5 14 LB0DC 3043 7757542 1 - - - 3.65 -5 15 LB0DC 3043 7757544 1 - - - 3.65 -5 16 LB0DC 3043 7757547 1 - - - 3.65 -5 17 LB0DC 3043 7757549 1 - - - 3.65 -5 18 LB0DC 3043 7757551 1 - - - 3.65 -5 19 LB0DC 3043 7757554 1 - - - 3.65 -5 20 LB0DC 3043 7757556 1 - - - 3.65 -5 For Example I would like to reduce nsmalldata to only the rows where SESSIONID==7757513 I have spent quite a bit of time with R manuals and still have not gotten there, can you help me? Thanks in advance. Regards, Bill Bill Hunsicker RF Micro Devices 7625 Thorndike Road Greensboro, NC 27409 336-678-5260(W) 610-579-9985(M) [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] R OLAP engines, an integration?
Hi Emmanuel, We are doing some work along these lines. See www.OpenI.org for details of our open souce OLAP solution contact our CTO, Sandeep Giri (via link on that site), for details. We haven't released any R integration yet, but we are doing some things internally it is on the OpenI development roadmap. I think OLAP definitely needs integration with some hard analytics. Sure, our business analysts are very comfortable moving around in OLAP space come up with some amazing insights, but OLAP just provides simple counts, sums etc. No sense of estimated errors or tests of significance. And, of course, no advanced techniques. One technical point, some methods would require a drill-through to the underlying data set. For example, while a mosaic plot can be generated from a 2-dimensional OLAP result table, generating a box plot corresponding to a OLAP bar chart (my personal favorite) needs the raw data points. We welcome everyone interested in this idea to join in the discussion effort. The OpenI forum http://sourceforge.net/forum/?group_id=142873 is probably a better place than here. On 10/14/05, Emmanuel Maroye [EMAIL PROTECTED] wrote: Hi. I am a consultant at KAE: Marketing Intelligence (http://www.kae.co.uk) working on market evaluation and forecasting. Working on large datasets I am looking for a solution to use R on datasets stored in an OLAP engine (like MIS Alea, Applix TM1 or Mondrian). Have you ever heard about such a solution? The idea is to apply R methods directly on data stored in an OLAP. The results being part of the OLAP as well (results write back)... Thanks in advance. Best regards, Emmanuel _ Emmanuel Maroye kae: marketing intelligence 209 - 215 Blackfriars Road London SE1 8NL United Kingdom D +44 20 7960 3358 M +44 7914 010 728 F +44 20 7960 3301 E [EMAIL PROTECTED] [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] adding 1 month to a date
OTOH, seq(as.Date(2004-01-31), by = month, length = 14) [1] 2004-01-31 2004-03-02 2004-03-31 2004-05-01 2004-05-31 [6] 2004-07-01 2004-07-31 2004-08-31 2004-10-01 2004-10-31 [11] 2004-12-01 2004-12-31 2005-01-31 2005-03-03 I would prefer to see dates forced to be within each month, not leaking into next month. IOW: [1] 2004-01-31 2004-02-29 2004-03-31 2004-04-30 2004-05-31, etc -- Jim Porzak Loyalty Matrix Inc. San Francisco, CA On 10/12/05, Marc Schwartz [EMAIL PROTECTED] wrote: Thanks to Prof. Ripley for pointing this out. One of the approaches that I had considered here was to set up a vector of the number of days in each month (adjusting of course for leap years), and use day arithmetic to add/subtract the appropriate number of days. However, it was easier to use seq.Date() and to further consider putting a wrapper around it to make it yet even easier to use. Marc On Wed, 2005-10-12 at 13:23 +0100, Prof Brian Ripley wrote: On Wed, 12 Oct 2005, bogdan romocea wrote: Simple addition and subtraction works as well: as.Date(1995/12/01,format=%Y/%m/%d) + 30 If you have datetime values you can use strptime(1995-12-01 08:00:00,format=%Y-%m-%d %H:%M:%S) + 30*24*3600 where 30*24*3600 = 30 days expressed in seconds. Sorry, not in general, as a month is not generally of 30 days (including in your example). seq.Date is a good way to do this. -Original Message- From: Marc Schwartz [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 11, 2005 10:16 PM To: t c Cc: r-help@stat.math.ethz.ch Subject: Re: [R] adding 1 month to a date On Tue, 2005-10-11 at 16:26 -0700, t c wrote: Within an R dataset, I have a date field called date_. (The dates are in the format -MM-DD, e.g. 1995-12-01.) How can I add or subtract 1 month from this date, to get 1996-01-01 or 1995-11-01. There might be an easier way to do this, but using seq.Date(), you can increment or decrement from a Time 0 by months: Add 1 month: This takes your Time 0, generates a 2 element sequence (which begins with Time 0) and then takes the second element: seq(as.Date(1995-12-01), by = month, length = 2)[2] [1] 1996-01-01 Subtract 1 month: Same as above, but we use 'by = -1 month' and take the second element: seq(as.Date(1995-12-01), by = -1 month, length = 2)[2] [1] 1995-11-01 See ?as.Date and ?seq.Date for more information. The former function is used to convert from a character vector to a Date class object. Note that in your case, the date format is consistent with the default. Pay attention to the 'format' argument in as.Date() if your dates should be in other formats. HTH, Marc Schwartz __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Replicate
Hi Marc, x = c(1,1,1,2,2,2,3,3,3,3) unique(x) [1] 1 2 3 Being a database guy myself, it took me a while to think unique rather than distinct -- HTH, Jim Porzak Loyalty Matrix Inc. San Francisco, CA On 9/16/05, Marc Bernard [EMAIL PROTECTED] wrote: Dear All, I have a vector x = (1,1,1,2,2,2,3,3,3,3) I am looking for a function to return a vector containing the distinct elements of x i,e y = (1,2,3) The following code gives the desired results: as.numeric(levels(as.factor(x))) Is there any other elegant way? Thanks, B - [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] [handling] Missing [values in randomForest]
On 9/11/05, Uwe Ligges [EMAIL PROTECTED] wrote: Jan-Paul Roodbol wrote: Does anyone know if randomForest in R can handle dataset with missings? See ?randomForest, you can omit observations including NAs by specifying na.action=na.omit Uwe, While strictly true, this tells randomForest to ignore any rows with one or more NAs in the predictor variables. Since, randomForest is often used for problems with a lot of (canidate) predictors, na.omit can result in a lot of rows being discarded. Hence, my reply to Jan-Paul's original posting suggesting the impute functions in randomForest. JIm Porzak Please do not cross-post! Please specify a sensible subject! Uwe Ligges Thank you Kind regards Jan-Paul __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Plot of multiple data sets
Paul's book has been available in the states since mid-Aug. Is on my local bookseller's shelf (, of course, mine) I would recommend it to anyone doing more than off the shelf graphics in R. As expected, an especially good look at grid. Hopefully it will be available in Europe soon. -- Best, Jim Porzak Loyalty Matrix Inc. San Francisco, CA On 9/9/05, Chris Buddenhagen [EMAIL PROTECTED] wrote: I found a lot of answers at this type of problem website wrt graphics and multiple plots- I bet the book will be useful when it comes out. http://www.stat.auckland.ac.nz/~paul/RGraphics/rgraphics.html Chris Buddenhagen, Botany Department, Charles Darwin Research Station, Santa Cruz,Galapagos. Mail: Charles Darwin Foundation, Casilla 17-01-3891 Avenida 6 de Diciembre N36-109 y Pasaje California Quito, ECUADOR __ EL CONTENIDO DE ESTE MENSAJE ES DE ABSOLUTA RESPONSABILIDAD DEL AUTOR. FUNDACION CHARLES DARWIN WWW.DARWINFOUNDATION.ORG [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] data manipulation
Also see Hadley Wickham's reshape package for more bells whistles. -- HTH! Jim Porzak Loyalty Matrix Inc. On 9/8/05, Thomas Lumley [EMAIL PROTECTED] wrote: This is what reshape() does. -thomas On Thu, 8 Sep 2005, Marc Bernard wrote: Dear All, I would be grateful if you can help me. My problem is the following: I have a data set like: ID time X1 X2 11 x111 x211 12 x112 x212 21 x121 x221 22 x122 x222 23 x123 x223 where X1 and X2 are 2 covariates and time is the time of observation and ID indicates the cluster. I want to merge the above data by creating a new variable X and type as follows: ID timeXtype 1 1 x111 X1 1 2 x112 X1 1 1 x211 X2 1 2 x212 X2 2 1 x121 X1 2 2 x122 X1 2 3 x123 X1 2 1 x221 X2 2 2 x222 X2 2 3 x223 X2 Where type is a factor variable indicating if the observation is related to X1 or X2... Many thanks in advance, Bernard - [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Thomas Lumley Assoc. Professor, Biostatistics [EMAIL PROTECTED]University of Washington, Seattle __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Order of boxes in boxplot()
On Thu, 7 Apr 2005, michael watson (IAH-C) wrote: Sorry for such an inane question - how do I control the order in which the boxes are plotted using boxplot() when I pass it a formula and a data.frame? It seems that the groups are plotted in alphabetical order... I want to change this Mick, Here's the code I use to order boxes by decreasing median value. SubtDays is variable of interest ConChnl is original grouping factor. tMedians is a temp data frame dConChnl is new grouping factor with desired order boxplot(SubtDays ~ ConChnl, . ### Default ordering of boxes tMedians - aggregate(SubtDays, list(ConChnl), median, na.rm = TRUE) dConChnl - factor(ConChnl, levels = tMedians[order(tMedians$x), 1]) boxplot(SubtDays ~ dConChnl, . ### Ordered by decreasing median HTH, Jim Porzak Director of Analytics Loyalty Matrix, Inc. (415) 296-1141 x210 R.LoyaltyMatrix.com www.LoyaltyMatrix.com __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Opening for a Statistics Practitioner in San Francisco
Statistics Practitioner Fluent in R - San Francisco CA Loyalty Matrix Inc., in downtown San Francisco, is expanding our team. We are a young, dynamic and growing team of multidisciplinary marketing and technical professionals. We deliver value to our clients by discovering actionable tactical and strategic insights in actual customer data augmented with demographics and research. You will work in the Client Services team doing EDA, basic statistics, data mining modeling. You will also assist RD to develop and integrate new methods into our proprietary customer intelligence platform MatrixOptimizerR. You will have a degree in statistics, be fluent in R and the Microsoft Office suite (especially Excel, Word and PowerPoint). SQL query skills are very helpful as is real-world business and marketing experience. The successful candidate will demonstrate creative ability to solve practical problems, juggle multiple projects, work in a multidisciplinary team and have fun. For more information on us see www.LoyaltyMatrix.com and R.LoyaltyMatrix.com. If interested, reply to [EMAIL PROTECTED] by February 18, 2005. In addition to your resume, please include a cover letter stating how your training, experience and skills would specifically contribute to our clients' success. We look forward to hearing from you. Best, Jim Porzak Director of Analytics Loyalty Matrix, Inc. R.LoyaltyMatrix.com www.LoyaltyMatrix.com (415) 296-1141 x 210 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] My useR! slides: Doing Customer Intelligence with R
FYI for useR! attendees others. The slides for my talk Doing Customer Intelligence with R are up on our R weblog: R.LoyaltyMatrix.com Also note any books ordered through the links on the blog will benefit the R Foundation - see blog for details. I will be using the blog as an informal log of our adventures using R for data mining, business intelligence and, in particular, customer intelligence. Comments on my blog posts are encouraged. Guest authors are welcome - contact me directly. Once again, many thanks to the useR! organizers and the local team in Vienna for the great meeting! Jim Porzak Director of Analytics Loyalty Matrix, Inc. R.LoyaltyMatrix.com www.LoyaltyMatrix.com __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Data Analyst Intern position in San Francisco
We've sent this position out to SF Bay Area schools. Since we have standardized on R as our preferred analytics platform it seemed appropriate to post here. We also have a full time Data Analyst position open. Search for Loyalty Matrix on [1]www.craigslist.org= for details. Jim Porzak Director of Analytics Loyalty Matrix, Inc. [2]www.LoyaltyMatrix.com Data Analyst Intern Loyalty Matrix is a successful profitable two-year-old start-up company based in downtown San Francisco. We are seeking a bright, organized, and motivated team player who appreciates the challenges and= rewards of working in an environment with a strong client focus. Primary Responsibilities: · Brainstorm with= business analysts to develop and customize OLAP models on customer= intelligence · Conduct customer= intelligence analysis using analytical and statistical models · Perform gap= analysis of client infrastructure on developing customer intelligence · Report directly= to the Director of Analytics Qualifications: · Graduating= senior or college grad with degree in Computer Science, Engineering, Math= or equivalent · Basic knowledge= of statistical principles, methodologies techniques · Intermediate= knowledge of Microsoft Excel and PowerPoint Preferred Qualifications: · Knowledge of= statistical tools (like R, SAS, JMP,, or SPSS) · Experience doing= SQL queries · Experience in= OLAP · Microsoft SQL= Server Analysis Services What You Will Learn: · Statistical= tools (like R, SAS, JMP, or SPSS) · OLAP concepts= and practice · Microsoft SQL= Server Analysis Services · Implementing= direct response marketing principles and techniques, including audience= selection recommendations, data extractions and manipulation, and program= measurement and evaluation · CRM systems= (E.Piphany, Siebel, SAP, etc.) · Reporting tools · ETL (Extraction,= Transformation and Load) tools Please note that this is a three-month internship that may lead to a permanent position. Submit your resume to [EMAIL PROTECTED] with [R] Internship in the subject heading. - References 1. 3Dhttp://www.craigslist.org/; 2. 3Dhttp://www.loyaltymatrix.com/__ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R]Running R remotely in Windows Environment? Thanks!
Thanks to Prof Ripley, Arne, Andy Bill for unambiguous suggestions!
Linux box is on order.
I'll take notes on our experience post a follow-up
in a few weeks. May be useful to other folks stuck in the Windows world.
-Jim
At 06:24 AM 1/29/2004, Pikounis, Bill wrote:
Jim,
I would really like to reiterate Professor Ripley's and Arne Henningsen
comments. The problem goes for any analytic software or system you might
want to use, not just R. My impression is that at least for part of it, you
want the individual users to use R as they would on their own desktops. (If
that is not the case, much of the rest of this note is pure FYI.) Even in
its most advanced 2003 Server edition, Windows is simply not designed to be
a multi-user system. Sure, it can reliably host a web server that may need
to run quick bursts of R batch-type jobs (analytics) and return results to
a client (e.g. web browser), but that does not sound like what you are
looking for (at least in part). And beyond the technical limitations, use of
Windows Terminal Server (Remote Desktop) / Citrix, etc. will cost much money
and implementation hassle and probably even legal headaches. We have had
colleagues here at Merck (over my and Andy Liaw's disbelief) that have tried
to shoehorn Windows this way, and even the speed of single, small jobs by 1
logged-on took longer on the server than on their much less powerful
laptops.
A Linux solution is very flexible, in our experiences (we have Windows XP as
corporate desktop standard). As stated, with Samba, you can map directories
that look like just another drive in Windows Explorer. Printing is just as
transparent in either direction. VNC (Virtual Network Computing) is very,
very nice to provide the individual user's Linux environment as just another
window on their Windows desktop. With the free utility of autocutsel,
clipboards can be synchronized for ease of cutting and pasting. And KDE, one
of several window manager analogues to Windows, is very sophisticated and
shares a lot in common with the Windows GUI from a user operations
standpoint. While it may sound like a hassle to get up and running now if
your shop is currently 99% Windows, the benefit will absolutely be clear
later.
Hope that helps,
Bill
Bill Pikounis, Ph.D.
Biometrics Research Department
Merck Research Laboratories
PO Box 2000, MailDrop RY33-300
126 E. Lincoln Avenue
Rahway, New Jersey 07065-0900
USA
Phone: 732 594 3913
Fax: 732 594 1565
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Arne Henningsen
Sent: Thursday, January 29, 2004 3:45 AM
To: Jim Porzak
Cc: [EMAIL PROTECTED]
Subject: Re: [R]Running R remotely in Windows Environment?
Hi,
I also suggest to use a Linux Server. You can work on this
machine via ssh
(e.g. with PuTTY) and transfer the input and output files
with scp or a samba
server (which is easy to install and very convenient to use
for windows
users).
Arne
On Thursday 29 January 2004 08:53, Prof Brian Ripley wrote:
On Wed, 28 Jan 2004, Jim Porzak wrote:
We are considering setting up a fast, RAM loaded machine
as an R-server
to handle the big problems not suitable for individual
desktops and,
also, to process ad hoc analysis requests via our portal.
We are 99% a
Windows shop, so first choice is a windows server. We'll
use (D)COM for
the portal interface and understand that.
What has me stumped is how to easily interface individual
analyst's
Windows desktops to the R-server. I haven't seen anything in the
archives, but I can't imagine this hasn't been done. What
am I missing?
R is not designed to be client-server on Windows. People I
know who do
this use Windows Terminal Server or Citrix.
I would question the value of this approach. Unless you
propose to run
64-bit Windows, a `RAM loaded' machine isn't `loaded', and
R under Windows
handles large amounts of memory much less effectively than
under Linux.
64-bit Windows is uncharted territory for R, whereas 64-bit
Unix/Linux is
well trodden.
--
Arne Henningsen
Department of Agricultural Economics
University of Kiel
Olshausenstr. 40
D-24098 Kiel (Germany)
Tel: +49-431-880 4445
Fax: +49-431-880 1397
[EMAIL PROTECTED]
http://www.uni-kiel.de/agrarpol/ahenningsen/
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[R]Running R remotely in Windows Environment?
We are considering setting up a fast, RAM loaded machine as an R-server to handle the big problems not suitable for individual desktops and, also, to process ad hoc analysis requests via our portal. We are 99% a Windows shop, so first choice is a windows server. We'll use (D)COM for the portal interface and understand that. What has me stumped is how to easily interface individual analyst's Windows desktops to the R-server. I haven't seen anything in the archives, but I can't imagine this hasn't been done. What am I missing? TIA! Jim Porzak Director of Analytics Loyalty Matrix, Inc. www.LoyaltyMatrix.com __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
